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Old Jan 1st 2015, 03:35 PM   #1
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Question How to remove the OEM Rear Sprocket and Hub/Flange assembly

I am part way through a 520 chain and sprocket assembly conversion. I have the left wheel nut removed, the OEM chain is off and I cannot figure out how to remove the OEM hub/flange. Videos on the Internet appear to show one being able to pull the hub off with ease once the wheel nut is removed.
What am I missing?
Your guidance is most welcome; thank you in advance.
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Old Jan 1st 2015, 03:39 PM   #2
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Once the chain is off and the sprocket side axle nut is off the sprocket/carrier should just pull right off. Then a 13mm allen key is needed as well as a 13 or 14mm socket to pull those pesky flange nuts off. You put the 13mm allen into the back of the cush drives otherwise they keep spinning.

-dylan
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Old Jan 1st 2015, 03:44 PM   #3
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The sprocket will catch on the lower chain guard, but I don't remember there being any trick to it. After the nut is removed, the sprocket and hub should slide off toward you.
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Old Jan 1st 2015, 03:47 PM   #4
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Thanks guys; that's what I thought.
Mine is S-T-U-C-K! I just won't budge. Maybe I'll have to try a penetrating oil or something?
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Old Jan 1st 2015, 04:01 PM   #5
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Originally Posted by Styler View Post
Thanks guys; that's what I thought.
Mine is S-T-U-C-K! I just won't budge. Maybe I'll have to try a penetrating oil or something?
Soak it overnight with a good dose of WD40. A thin layer of copper grease on reassembly with stop that next time. Good luck.
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Old Jan 1st 2015, 06:11 PM   #6
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Heat gun. There's a layer of grease between the splined shaft and the sprocket assembly. Warm it up, and you can try using a piece of wood an d alight hammer and gently tap it out from the wheel side.
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Old Jan 13th 2015, 06:36 PM   #7
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Torque specs for flange nuts and sprocket nuts?

Edit: All specs available here:
https://drive.google.com/file/d/0B9A...it?usp=sharing and
http://api.viglink.com/api/click?for...38332923598310 (provided by members of this community).

Last edited by Styler; Jan 15th 2015 at 07:37 AM.
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Old Jan 13th 2015, 06:44 PM   #8
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The cush drive damper nuts are 44 nm, with Locktite applied. The studs also have provisions for safety wire as well.

These are the studs that are anchored in the circular rubber columns, sometimes seen in titanium and polyurethane in the aftermarket.
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Old Jan 13th 2015, 06:55 PM   #9
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Anybody have the torque specs for the nuts that hold the sprocket to the sprocket carrier?
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Old Jan 13th 2015, 07:39 PM   #10
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OK; I made the mistake of not photographing the assembly of the old front sprocket on the shaft before I took it off and cleaned the shaft of corrosion. (A week ago.)
In putting on the replacement front sprocket, I noticed that one side has more of a collar (protrudes more) than the other side. Which faces outward, the side with more or less of a protrusion?

Last edited by Styler; Jan 14th 2015 at 07:56 AM.
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assembly, hub or flange, hub/flange, oem, oem rear sprocket, rear, remove, sprocket



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